Portable heater



FIG. 1 is a front elevational view of the portable heater showing my new design, the rear elevational view being the mirror image of the front view;

FIG. 2 is a left side elevational view thereof,

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a top plan view thereof

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a perspective view taken from the front, left side and top of the portable heater; and,

FIG. 7 is a perspective view taken from the front, right side and top of the portable heater with the cover opened. 

The ornamental design for a portable heater, as shown and described. 